What I mean by this question is – do you just need some/all of your contacts from your database to sync to your native Contacts on your phone? And same question for calendar – is that all I need? Just to see this information. Or, do I want more of a “mini-database” on my smart device? So, I can clear activities on my phone, add notes from the meeting and that will sync back to my database. Or, when I make a call or send an email from my phone, do I want to have that information in the database? Each CRM can manage this differently so understanding exactly what you need is important.